Query Language

The text search engine allows queries to be formed from arbitrary Boolean expressions containing the keywords AND, OR, and NOT.

For example:

information retrieval

finds documents containing 'information' and 'retrieval'

information and retrieval

same as above

information or retrieval

finds documents containing either 'information' or 'retrieval'

information not retrieval

finds documents containing 'information' but not 'retrieval'

information near retrieval

finds documents where the two words a close to each other. The rank increases as word distance decreases.